/Engine/Plugins/Runtime/MassGameplay/Source/MassActors/Public/MassAgentSubsystem.h
Bound to UMassSimulationSubsystem.OnProcessingPhaseStartedDelegate and called before every processing phase start
void OnProcessingPhaseStarted ( const float DeltaSeconds, const [EMassProcessingPhase](API\Plugins\MassEntity\EMassProcessingPhase) Phase )